TrailVault Power Calculator
⚡ Free Tool
TrailVault
Power Calculator
Tell us how you're using power and we'll calculate exactly what you need — panels, battery, and everything in between.
Step 1 — What are you powering?
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Van / RV Build
Camper van, Class B/C, travel trailer
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Overlanding & Camping
Truck, rooftop tent, base camp
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Off-Grid Cabin
Cabin, tiny house, remote property
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Home Backup
Power outages, storm prep, essentials
Step 2 — Select what you're running and how long
Step 3 — Add anything else (optional)
Don't see your device? Add it manually.
Step 4 — Choose your safety buffer
Buffer factor
Accounts for inverter losses, wiring, and battery degradation over time
Your results
Recommended Minimum Capacity
0Wh
⚠️ A note on cycling appliances: This calculator assumes 100% continuous run time for all selected devices. In real-world use, compressor-based appliances (refrigerators, freezers, window ACs, mini-splits, heat pumps, well pumps) cycle on and off — typically running only 40–60% of the hours you specify. That means your actual daily usage is often 30–40% lower than the number above. We use the higher estimate on purpose so your battery system has real-world headroom.
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⚖️ Compare all portable power stations side by side →
Load breakdown
Device
Watts
Hrs/day
Wh/day
Get your system recommendation
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